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            <li><h2 class="docModule">签名专区</h2></li>
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                    <cite>自行实现签名</cite>
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                <legend><a name="use">自行实现签名</a></legend>
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            <p>如果未使用开放平台SDK，需要自行实现签名过程。</p>

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                <legend>如何签名</legend>
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            <p>1.筛选并排序</p>
            <p>
                获取所有请求参数，不包括字节类型参数，如文件、字节流，剔除sign字段，剔除值为空的参数，并按照第一个字符的键值ASCII码递增排序（字母升序排序），如果遇到相同字符则按照第二个字符的键值ASCII码递增排序，以此类推。</p>
            <p>2.拼接</p>
            <p>将排序后的参数与其对应值，组合成“参数=参数值”的格式，并且把这些参数用&amp;字符连接起来，此时生成的字符串为待签名字符串。</p>
            <p>例如下面的请求示例，参数值都是示例，开发者参考格式即可：</p>
            <pre class="layui-code">REQUEST URL: http://open-test.yourdomain.com/api
REQUEST METHOD: POST
CONTENT:
app_id=2014072300007148
method=alipay.mobile.public.menu.add
charset=GBK
sign_type=RSA2
timestamp=2014-07-24 03:07:50
biz_content={"button":[{"actionParam":"ZFB_HFCZ","actionType":"out","name":"话费充值"},{"name":"查询","subButton":[{"actionParam":"ZFB_YECX","actionType":"out","name":"余额查询"},{"actionParam":"ZFB_LLCX","actionType":"out","name":"流量查询"},{"actionParam":"ZFB_HFCX","actionType":"out","name":"话费查询"}]},{"actionParam":"http://m.alipay.com","actionType":"link","name":"最新优惠"}]}
sign=e9zEAe4TTQ4LPLQvETPoLGXTiURcxiAKfMVQ6Hrrsx2hmyIEGvSfAQzbLxHrhyZ48wOJXTsD4FPnt+YGdK57+fP1BCbf9rIVycfjhYCqlFhbTu9pFnZgT55W+xbAFb9y7vL0MyAxwXUXvZtQVqEwW7pURtKilbcBTEW7TAxzgro=
version=1.0
</pre>
            <p>则待签名字符串为：</p>
            <pre class="layui-code">app_id=2014072300007148&amp;biz_content={"button":[{"actionParam":"ZFB_HFCZ","actionType":"out","name":"话费充值"},{"name":"查询","subButton":[{"actionParam":"ZFB_YECX","actionType":"out","name":"余额查询"},{"actionParam":"ZFB_LLCX","actionType":"out","name":"流量查询"},{"actionParam":"ZFB_HFCX","actionType":"out","name":"话费查询"}]},{"actionParam":"http://m.alipay.com","actionType":"link","name":"最新优惠"}]}&amp;charset=GBK&amp;method=alipay.mobile.public.menu.add&amp;sign_type=RSA2&amp;timestamp=2014-07-24 03:07:50&amp;version=1.0</pre>
            <p>3.调用签名函数</p>
            <p>
                使用各自语言对应的SHA256WithRSA(对应sign_type为RSA2)或SHA1WithRSA(对应sign_type为RSA)签名函数利用商户私钥对待签名字符串进行签名，并进行Base64编码。</p>
            <p>4.把生成的签名赋值给sign参数，拼接到请求参数中。</p>
            <pre class="layui-code">/**
@param content 加签内容
@param privateKey 加签私钥
@param charset 加签字符集
@param charset 签名方法
**/
String AlipaySignature.rsaSign(String content, String privateKey, String charset,String signType)
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